1. Efectuează:
a) 2/5+3/4;
b) 3/7.(2/5+3/4);
c) 3/7.2/5;
d)3/7.3/4;
e)3/7.2/5+3/7.3/4 ce observi?


Repede va rog pana mâine luni trebuie predate